Bump metrics.version from 4.2.25 to 4.2.26 #1749

Job	Run time
build-all	3m 21s
tests (scylla, -Pscylla-murmur -Dtest="*/diskstorage/cql/", murmur-diskstorage-java8, 8)	14m 54s
tests (scylla, -Pscylla-murmur -Dtest="*/graphdb/cql/", murmur-graphdb-java8, 8)	56m 13s
tests (scylla, -Pscylla-murmur -Dtest="*/hadoop/", murmur-hadoop-java8, 8)	12m 11s
tests (scylla, -Pscylla-murmur -Dtest="*/core/cql/", murmur-core-java8, 8)	4m 28s
tests (scylla, -Pscylla-murmur -Dtest="*/diskstorage/cql/", murmur-diskstorage, -Pjava-11, 11)	15m 19s
tests (scylla, -Pscylla-murmur -Dtest="*/graphdb/cql/", murmur-graphdb, -Pjava-11, 11)	56m 6s
tests (scylla, -Pscylla-murmur -Dtest="*/hadoop/", murmur-hadoop, -Pjava-11, 11)	11m 42s
tests (scylla, -Pscylla-murmur -Dtest="*/core/cql/", murmur-core, -Pjava-11, 11)	4m 28s
	2h 58m 42s

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